Variability in the Holocene marine radiocarbon reservoir effect for the Tropical West Pacific

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dc.contributor.authorHua, Qen_AU
dc.contributor.authorUlm, Sen_AU
dc.contributor.authorYu, Ken_AU
dc.contributor.authorClark, Ten_AU
dc.contributor.authorNothdurft, LDen_AU
dc.contributor.authorLeondard, NDen_AU
dc.contributor.authorPandolfi, JMen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorZhao, JXen_AU
dc.date.accessioned2023-01-19T22:12:52Zen_AU
dc.date.available2023-01-19T22:12:52Zen_AU
dc.date.issued2021-11-17en_AU
dc.date.statistics2022-06-03en_AU
dc.description.abstractReliable determination of the marine radiocarbon reservoir effect (e.g., marine radiocarbon reservoir correction (ΔR)) is important for the construction of robust radiocarbon chronologies for marine archives for various research areas including archaeology, palaeoecology, paleoceanography, Quaternary research and climate change studies. In this study, we examined temporal ΔR variability for the South China Sea (SCS) and the Great Barrier Reef (GBR) during the past ~8.1 ka based on ¹⁴ C analysis of ²³⁰ Th-dated corals. Coral samples, including Acropora sp., Cyphastrea sp., Favia sp. and Porites sp., were collected from Xisha (or Paracel) Islands and Yongshu Reef, Nansha (or Pratly) Islands in the SCS; Clerke Island, Gore Island, Haggerstone Island, Alexandra Reef and High Island in the northern GBR; and Great Keppel Island in the southern GBR. A total of 44 unaltered coral samples (based on SEM screening, δ²³⁴ U and initial ²³⁰ Th/²³²Th ratios) were analysed for ²³⁰ Th and ¹⁴ C. ²³⁰ Th dates were determined using a VG Sector-54 thermal ionization mass spectrometer (TIMS) or a Nu Plasma MC-ICP-MS in the Radiogenic Isotope Facility, The University of Queensland, with a precision better than 0.5% (2σ). Subsamples of these dated corals were then taken for radiocarbon analysis using the STAR AMS facility at ANSTO with a typical precision of ~0.3-0.4% (1σ). Results show large ΔR variations of ~410 yr and ~490 yr for the SCS and the northern GBR at ~5.5-8.1 ka and ~5.5-7 ka, respectively, and a smaller ΔR variability of ~200 yr for the SCS at ~2-3.5 ka. Changes in the sources (or ¹⁴ C level) of upwelled waters in the Tropical East Pacific, and variations in Pacific-wide and regional/local ocean circulation associated with climate change might be responsible for these observed ΔR variations [1]. The results of our study also indicate the need for regional marine radiocarbon calibration curves for improved radiocarbon dating of marine samples as the observed Holocene ΔR values for the Tropical Pacific are not fully reproduced by recent modelling work using a 3D ocean model [2], which takes into account climate change effects. Ocean circulation changes were included in the model for the period 11.5-50 ka but possibly not considered or not well represented for the Holocene, which might explain the differences between the observed and modelled ΔR values. © The Authorsen_AU
dc.identifier.citationHua, Q., Ulm, S., Yu, K., Clark, T. R., Nothdurft, L., Leonard, N., Pandolfi, J., Jacobsen, G., & Zhao, J.-X. (2021). Variability in the Holocene marine radiocarbon reservoir effect for the Tropical West Pacific. Paper presented to the 15th International Conference on Accelerator Mass Spectrometry. ANSTO Sydney, Australia. November 15th – 19th, 2021, (pp. 62). Retrieved from: https://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.conferenceenddate19 November 2021en_AU
dc.identifier.conferencename15th International Conference on Accelerator Mass Spectrometryen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate15 November 2021en_AU
dc.identifier.pagination62en_AU
dc.identifier.urihttps://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14419en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectQuaternary perioden_AU
dc.subjectCarbon 14en_AU
dc.subjectAquatic ecosystemsen_AU
dc.subjectArchaeologyen_AU
dc.subjectHistorical aspectsen_AU
dc.subjectEcologyen_AU
dc.subjectOceanographyen_AU
dc.subjectClimatic changeen_AU
dc.subjectChina Seaen_AU
dc.subjectSeasen_AU
dc.titleVariability in the Holocene marine radiocarbon reservoir effect for the Tropical West Pacificen_AU
dc.typeConference Abstracten_AU
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